Answer the following questions according to the following rules Negative 1 4 → negative 5 8 → negative 9 a → B ↓ ↑ ↓ ↑ ↓ ↑ ↓ ↑ 2 → negative 3 6 → negative 7 10 → C → D Is the number 2010 positive or negative? What's the position in a.b.c.d? Give reasons and answers!

Answer the following questions according to the following rules Negative 1 4 → negative 5 8 → negative 9 a → B ↓ ↑ ↓ ↑ ↓ ↑ ↓ ↑ 2 → negative 3 6 → negative 7 10 → C → D Is the number 2010 positive or negative? What's the position in a.b.c.d? Give reasons and answers!

The number 2010 is a positive number. At position C, every four numbers are cycled. 2010 △ 4 = 502 plus 2. In other words, the position of the number 2010 is actually the same as that of the second number, and it is a positive number

How many places does the score 51 / 50 rank in the sequence of 1 / 1,2 / 1, 1 / 2.3/1.2/2.1/3.4/1.3/2.2/3.1/4.5/1

1 / 1, (2 / 1, 1 / 2). (3 / 1.2 / 2.1 / 3). (4 / 1.3 / 2.2 / 3.1 / 4). 5 / 1 is divided into groups with brackets above, each group has: 1, 2, 3, 4. The numerator + denominator of each group = n + 151 + 50 = 101101-1 = 100, indicating that 51 / 50 is in group 100, the first is: 100 / 1100-51 = 49, then 51 / 50 is in group 100, 1 + 49 = 50

On the blackboard is written a row of connected natural numbers 1, 2, 3-51. Party A and Party B cross out three consecutive numbers in turn. It is stipulated that after who has crossed
On the blackboard is written a row of connected natural numbers 1, 2, 3, 4, 5 ----- 51. Party A and Party B take turns to cross out three consecutive numbers. It is stipulated that after who has crossed, the other person can't do it any more, and who will win. Does Party A have a winning strategy?

If a delimits the middle numbers 25, 26 and 27 first, the 51 numbers from 1 to 51 will be divided into two groups, each group has 24 numbers. In this way, as long as B has numbers to delimit in one group, then a will always have numbers to delimit in the relative position in the other group. Therefore, if a delimits first and carries out the above strategy, then a will surely win